Reenforcing joint for paper containers



Sept. 8, 1925. 1,552,868

A. MOORE REENFORCING JOINT FOR PAPER CONTAINERS Filed Ausf.. 5. 1920 Patented Sept. 8, 1925.

UNITED STATES PATENT OFFICE.

ARLINGTON MOORE, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CLARKE-MOORE CORPORATION, F WILMINGTON, DEIAWARE, A. CORPORATION OF DELAWARE.

BEENFOR/CING JOINT FOR PAPER CONTAINERS.

Application flied August 5, 1920. Serial No. 401,414.

To aZZ whom z't may concern:

Be it known that I, ARLJNG'roN Moons, a citizen of the United States, and a resident of Worcester, county of Worcester, State of Massachusetts, have invented an Improvement in Reenforcing Joints for Paper Containers, of which the following is a specification.

This invention more particularly relates to certain improvements in the form of joint between the tubular side Wall and the end wall, or bottom of a paper container, or between the flange and top of the closure therefor, and in which the joint is formed by folding and pressing the adjacent edgeportions together.

Prior to my invention various attempts have been made to produce a satisfactory joint at the point above referred to, but, so far as I am aware` these joints have been unsatisfactory for the reason that they either are not water tight, when originally formed, or are liable to open and become leaky when subjected to some of the various pressures which are likely to be applied to containers of this character.

The object of my invention is to provide a form of joint between the tubular or cylindrical side Wall, and the disc-shaped end 3u wall of a paper container', which will be water tight, and will be sufficiently rigid to prevent distortion due to the various pressures to which containers of this character are likely to be subjected, so that leakage by reason of such pressures may be prevented and a construction may be produced which is stronger at the joint than at other points therein.

I accomplish this object by proyiolinpv the construction hereinafter described and illustrated in the accompanying drawing, in which:

Figs. 1, 2, 3 and 4 are detail sectional views illustrating'` difl'erent steps in the process of manufacture and Fig. 5 is a view, partly in elevation and partly in central longitudinal section, of a finished container embodying the invention.

In F ig. 5 of the drawing an embodiment 50 of the invention is shown as applied to both the bottom and the cover of the container,

and it will be understood that, so far as the present invention is concerned, it is immaterial to what portion of the container it is 55 applied, the advantages secured by its application to the cover being as important as hose secured by its application to the bot- In the drawing', therefore, the cylindrical can body a is shown as having its bottom b connected thereto by the same form of joint as that employed in connecting the circular top c with the cylindrical flange d, which latter is adapted to be telescoped with the top end of the can body. However, the description will be confined, as a. matter of convenience, to the formation of the joint between the top and flange of the closure, although it is equally applicable to any construction in which a tubular side wall is connected to an end wall which is fitted therein, and it will be understood that the terms side-Wall and,end-Wall are terms of general application.

While the process by which the joint is formed is made the subject of another application, the more important steps of this process will be referred to in a general Way, to enable the construction to be more clearly understood.

At the beginning of the operation of the formation of the joint between these sections, a straight, cylindrical paper tube, which is cut to suitable length, and a fiat circular disc, of suitable diameter are provided, it being noted that, when the successive operations are performed thereon the paper is in a somewhat moist state, so that the mass may be molded, or will flow, so that it may be reformed without rupture of the fibres. j

In Figs. 1, 2, 3, and 4, of the drawing, three preliminary stages and the final stage of the forming process are illustrated.

At the beginning of the process the disc, or end wall c is flanged or cupped so that its external diameter is equal to the internal diameter of the tube d, and then it is inserted in the tube in a predetermined position with relation to the end of the tube, so that its flange is telescoped with the end portion of the tube and the latter extends beyond the end of the flange, to a certain extent. this stage of the operation being shown in Fig. 1.

By means of suitable tools, an internal, parallel sided, annular groove is indented in said telescoped portions of the tube and ange, by pressing the material outwardly at the outer surface of the end-wall c, so

that one side of the groove, which is formed in its flange, will be in the plane of the outer surface of the end-wall, this stage in the operation being indicated in Fig. 2.

Oppositely disposed shoulders d', d", and an intervening rim-portion d, disposed perpendicularly thereto, are thereby formed in the tube d, and an annular edge portion e', which seats against the shoulder d', and ortions c2 and c, which correspond to, an respectively engage the portions d2 and da of the tube, are formed in the flange of the endwall c. The extent to which the material is pressed outward, to form the groove, is approximately double the thickness of the material, so that the internal diameter of the portion c2 is as great as the external diameter of the tube adjacent its shoulder d. The telescoped portions of the tube and flange of the end wall are then bent inward thru a complete semi-circle from a point a short distance above the s oulder portions am, c, towards the longitudinal central or axial line of the tube, or side-wall, and towards the end wall, until the end portion of the side wall is engaged with the end-wall, and the end portion of both side wall and flange extend towards the side-wall, this stage of the operation being shown in Fig.

In the final stage, this operation is continued until the edge of the side wall is forced firmly against the groove bottom c2 and lies between the edge portion c and shoulder c3 thereof, and the end-portion of the flange is doubled on itself within the wall-end-portion and is completely enclosed thereby, the edge of the flange being forced against the flange portion at and beyond the upward bend therein from the shoulder portion cs and beiner up-set thercagainst, as hereinafter more fully described.

When the joint is moulded into its final form, as indicated in Figs. 4 and 5, the different portions are shaped to form cylindrical rim-portions c4, cl, which extend at right angles to the shoulders c3, d3, end or top portions c, d5, which extend inward towards the center of the can, at right angles to the portions c4, d, oblique portions c, d which extend obliquely towards the end- Wall, from the inner ends of portion c, d5, and cylindrical portions c', d?, which extend from portions c", d, at right angles, to the end wall, and the extreme end-portions c", da, which extend at right angles to portions el, d", and reversely to the portions e, d, or towards the side wall, so that portion d8 lies flat on the end wall, and extends to the flange portion c2, and the portion c lies on portion d and abuts with portion 0*, the different portions of the side wall thus entirely enclosing the doubled over end portion of the flange.

It is to be noted that all the bends are more or less rounded, to avoid sharp corners, or

angles, which would tend to break the fibers of the paper.

Inasmuch as it is importantto note the different pressures to which the joint, or rib, which is constructed, is subjected, in the final stage of the operation, the instrumentalities which are employed, and the directions in which they move, are indicated in Fig. 4.

As indicated, a segmental mandrel l is expanded to fit tightly at its side, against the inner surface of the side walland, at its end, against the inner surface of the end Wall, said mandrel being moved into predetermined relation to a bolster 3, which is bored to receive the portions d2, da and d* of the joint, and the action of which is supplemented by a segmental anvil 2, which 1s arranged to move inwardly, after the construction of Fig, 3 has been placed in position in the bolster, to clamp the tube against the mandrel l and to engage the surface of portion d' and a part of portion d2. A plunger 4 is arranged to operate within the bolster 3 and is adapted to engage the end surface d, and a se mental mandrel 5 is adapted to be expande into engagement with the surfaces of portions d and d".

In the final portion of the operation, the plunger 4 is moved towards the mandrel 1 and the mandrel 5 is expanded at the same time, the plunger 4 being moved to its final position in advance of the final expanding movement of the mandrel 5, so that, in the final movement of the latter the material is crowded between the plunger 4 and mandrel l and pressed against the anvil 2 and bolster 3.

In this operation the edge of the side-wall portion d is forced into the groove against the flange portion c2, the portion adjacent said edge being crowded in between the surfaces of portions c and c so that the materi al is closely compacted in the groove formed by the bolster 3 and anvil 2. At the same time the edge of portion 08 is forced against the surface of portion e4, the width of which latter is approximately double the thickness of the stock and is rigidly held by the bolster 3. The length of the flange of the end-wall is such that its edge will be en gaged with the surface of portion c* before the edge of portion (ZS engages the surface of portion 02, so that the ed e portion ca of the flange will be 11p-set against the surface of portion c4 to a suflicient extent to fill the angular space included by the double-over end-portion of the flange. As a result the port1on cs is of double thickness at its edge and tapers to normal thickness at the point where it is doubled back on itself.

At the time the movement of these operating devices is finished, the folded end portions will be compressed under a ver high pressure, so that the folds of material are compacted into a solid mass, and a rib is formed, which is provided with an integral core, formed from the upset end portion'c, said core substantial y increasing the rigidity of the rib and serving to anchor the end of the flan e within the side-wall end portion by whic i it is enclosed.

In the final compressing operation, the rib is subjected to transverse compression against all its surfaces, the force of the mandrel 5 having a radial component, in the direction of the arrow w, in Fig. 4, against the obli uesurface d and the cylindrical surface il", which force is directly resisted by the bolster 3, also a component against the oblique surface d, in the direction of arrow y, which force is resisted by the mandrel 1, anvil -2.and bolster 3, thereby causing v4a transversejcompression of the ribin an oblique direction and assisting in the operation ofcrowding the material into the groove ofithe anvil 2 and bolster 3 and in causing a ortion of the up-set end of the flange of tie end wall to be forced into the recess between the curved surface connecting the portions c8 and c* andthe adjacent surface of portion d".

The plunger 4, when moved, causes coinpression in the direction of arrow z, and,

as the plunger 4 and mandrel 1 are rigidly held during the final expanding movement of the mandrel 5, the crowding or forcing of the material therebetween causes a continuation of this compression, so that the rib formed by the end portion of the Side wall and the folded portion of the end-wall flan e, which is enclosed thereby, will be firm y pressed against the end wall, and the edge portion de of the side wall will be firmly clamped betweenthe end wall and its shoulder portion c".

The above described construction is especially designed to offer a strong resistance to an force to which it is liable to be subjecte for outward pressure on the end wall is 'resisted by the square, inwardly facing shoulder d, c, at its rim and by the en iortion of the side Wall, which is interocked with the flange of the end wall and forms therewith a rib, which, is ressed firml against the end Wall and exten s over, and bears against a substantial portion of its outer surface. Also, inward pressure on the end wall will be resisted by the outwardly facing shoulder d and by the edge flange thereof, which is firmly anchored against withdrawal by its upset edge portiopl c, within the end portion of the sidewa Inward pressure against the side edge of the rib, or in the plane thereof, which would tend to press it into elliptical form, or otherwise distort it, will be resisted, up to the point at which the stock will be ruptured, without opening the joint, so that it will leak, as the rib possesses a considerable degree of resilienc which permits distortion to a substantia extent without displacement, this being partly due to the closeness with which the-folds of the material which form the rib, are compacted together, and also, to the fact that the surfaces of the layers are cylindrical and concentric and that the extreme end portions of the flange of the end wall are firmly locked and clamped together between the. outer layers of material.

I claim:

1. In a paper container, a side wall member, a flanged end wall member inserted within the side wall member, said side wall and end wall members being joined together in a joint in which the flan e of the end wall and that orton of the si e wall beyond the general p ane of the edge wall are pressed into a solid mass with the marginal portion of the end wall flange folded under that part of said flange adjacent thereto, whereby such adjacent portion is arched upwardly, and the container wall margin brought over, down past and under such infolded marginal parts of the end wall flange and substantially into contact with the base of the end wall flange on the inner side thereof. 2. In a aper container, a side-wall having an internal, transversely disposed groove, an end Wall seated against the outwardly facing side of said groove and having an edge-flange engaged with the bottom and the inwardly facing side of said groove, the end portion of said side wall being extended outwardly from said groove, then transversely over said end wall and inwardly into engagement therewith, then transversely so that its edge engages the inner surface of the flange portion lying against the bottom of the groove, and said flange having its end-portion doubled on itself in a solid mass and enclosed within and pressed in close contact with said endportion of the side wall.

3. In a aper container, a side wall having an internal, transversely i disposed groove, providing inwardly and outwardly facing shoulders, an end wall seated against said outwardly facing shoulder and having an edge-flange extending outwardly therefrom, said flange being formed to provide a shoulder arranged in engagement with said inwardly facing shoulder, and the end-portion of said wall and of said flange, beyond said shoulders, bein extended outwardly with relation to saidg end wall, then bein doubled-over onto the same with their en edges in abutment with the interior surface of the flange between the point where it is doubled over and its point of connection with the end wall.

4. In a paper container, a cylindrical side-wall having an internal annular groove adjacent one end, a circular end-wall seated,

:fit its edge portion, against the outwardly acin ed eange formed to engage the bottom an inwardly facing side of said groove and extending therefrom within the sidewall, the extended portions of said side wall and llange being pressed to ether and bent inward towards the end-wal and being bent reversely, so that a double thickness of the end-portion of the [lange is enclosed by the end-portion of the side-wall and the outer surface of the side-wall is pressed against the outer surface of the end-wall, and is en aged at its end with said ilange adjacent tie end-wall.

5. In a paper container, a cylindrical side-wall havin an internal annular groove adjacent one en a circular end-wall seated, at its ed e portion, against the outwardly facin si e of said groove and having an edgeange formed to enga e the bottom and inwardly facing side o said groove, said side-wall and flange being extended in telescoped engagement, outwardly with re lation to the endwall, then over it, and then reversely towards it, and towards the A side-Wall, so that the end-portion of the 'said ed e being up-set to side-Wall encloses the end-portion of the flange and is pressed against the surface of the end-wall and its edge is pressed into engagement with the flange portion, within said groove, and the edge o said flange is abuttcd against the said outwardly extending portion thereof, the liortion adjacent ll the space enclosed y said side-wall-end-portion.

6. In. a paper container, a cylindrical side-wall, an end-wall fitted Within said side-wall and having an edge-flange extending outwardly therefrom in telesco ed relationwith theV end-portiony of said sidewall, said teleseoped portions of said sidewall and Bange being extended inward thru a semicirenmference with their ends in enagei'n'ent with the inner surface of the ange 4adjacent the end wall, the edge portion of the flange being 'up-set and the folds of said end-portions being ressed together to f orm a rib, the core o which consists of said up-set end-portion of the Bange and side of said 'groove and having an natascia vthe end-wall and towards the side-wall successive] so that the edge lof said lian e and side-wa portions are engaged with t e inf' ner surface of the flange, said bent-over endportions being ressed togetheragiiinst said end-wall and tje outwardly extending por-i tion of said sidewall, toV form a reenforcing rib, and the end-portion ofsaid flange being en a ed withthe' porton'thereof adjacent said indentation and being upset thereagainst to form a core for said rib.

8. In a. paper container, a cylindrical side-wall, an end-wall .fitted therein and liavino an edge-iiange extending outwardly therefroni in telescopedrelation with the end-portion of said sidewall A said side-wallend-portion and said liange yeingv circularly recessed, internally, in the plane of the sur'- faee of the end-wall, to rovidesaid walls with' nterengaging shou ders, the portions of said flan e and side-wall being. extended outwardly rom said recess, to form a cylindrical rmportion, then riglit-angiilarly'towards the center thereof. to form a v'topportion, then inwardly towards the end wall, in an oblique direction, and thenat right angles thereto, and then rightangularly towards the side wall, into'en agement with the inner surface of the ange adjacent the end wall, said enla'ging portions of the side wall and ange being pressed'todgether into the an-gnlarjspace be tween sai end :wall and the end-portion of the side-wall adjacent thereto.

In testimony 4whereof, I have naine to this specification,

' ARLINGTON" MOORE.

signed lmy :lit its edge portion, against the outwardly acin ed eange formed to engage the bottom an inwardly facing side of said groove and extending therefrom within the sidewall, the extended portions of said side wall and flange being pressed to ether and bent inward towards the end-wal and bein bent reversely, so that a double thickness o the end-portion of the flange is enclosed by the end-portion of the side-wall and the outer surface of the side-wall is pressed against the outer surface of the end-wall, and is en aged at its end with said flange adjacent t ie end-wall.

5. In a paper container, a cylindrical side-wall havin an internal annular groove adjacent one en a circular end-wall seated, at its ed e portion, against the outwardly facin si e of said groove and having an edgeange formed to enga e the bottom and inwardly facing sidel o said groove, said side-wall and flange being extended in telescoped engage1nent,`outwardly with relation to the end-wall,` then over it, and then reversely towards it, and towards the side-wall, so that the end-portion of the side-wall encloses the end-portion of the ilange and is pressed against the surface of the end-wall and its edge ispressed into engagement with the llange portion, within said groove, and the edge o said ilange is abuttcd against the said outwardly extending portion thereof, the tpxortion adjacent said edge being up-set to l1 the space enclosed by said side-wall-end-portion.

6. In, a paper container, a cylindrical side-wall, an end-wall fitted within said side-wall and having an edge-flange extending outwardly therefrom in telescoped relationwith the end-portion of said sidewall, said telescoped portions of said sidewall and flange being extended inward thru a semi-circumference with their ends in engagement with the inner surface of the flange `adjacent the end wall, the edge' portion of the flange being up-set and the folds of said end-portions being ressed together tof orm a rib, the core op which consists of said up-set end-portion of the ilange and side of said groove and having anA interlocking the exterior of which consists of the endportion of the side-wall 7. In a paper contandr, a cylindrical side wall, an end-wall/ isposed within said side wall and having an edge flange extending outwardly therefrom in telescoped relation Vwith the end-portion of said vaide wall, said side-wall-end-portion and said flange being circularly indented, to form shoulders and being bent towards the middle of the container, from points at a distance be ond said indentation and extended reverse y inwardly towards `the end-wall and towards the side-wall successive] so that the edge 'of said lian e and side-wa l portions are engaged with tie iii-r ner surface of the flange, said bent-over endportions being ressed together against said end-wall and t e outwardly extending por-i tion of said side wall, to forni a reenforcing rib, and the end-portion of said flange being engaged with thev portion thereof adjacent said indentation and being up-set thereagainst to iorin a core for said rib.

8. In a paper container, a cylindrical side-wall, an end-walll Afitted therein and having an edge-flange extending outwardly therefrom in telescoped relation with the end-portion of said side wall, said side-wallend-portion and said flange being crcularly recessed, internally, in the plane of the surface of the end-wall, torovide said walls with interengaging shou ders, the portions of said flange and side-wall being4 extended outwardly from said recess, to form a cylindrical rim-portion, then right-singularly towards the center thereof. to form a Itopportion, then inwardly towards the end wall, in an oblique direction, and then-at right angles thereto, and then right angularly towards the side wall, inicien agement with the inner surface of the ange adjacent the end wall, said engaging portions of the side wall and flange being pressed to ether into the angular .space between sai endwall and the end-portion of the side-wall adjacent thereto.

In testimony whereof, I have signed my naine to this specification.

ARLINGTON MOORE.

Certicate of Correction.

It is hereb certified that in LettersPa-tent No. 1,552,868, granted Septen'iber 8` 192@ upont ie aplicationf of Arlington Moore, of Worcester, Massachusetts, for an impi'ovement-in Beenforcing Joints for Paper Containersf errors ap ear in the printed specication requiring correction as follows: Page 4' line 33, c aim 5, before the word said insert the words inner aide of its, and l'ne 34, strike out the word thereof Ysame page, line 47, claim 6, after the com ound word up-set insert the words to form a. core, and line 48, after the word to-gether i insert the words said core; line 49, after the word rib beginning `with the comma and the article the strike out all to andincluding the compound .word side-wall in line 52; and that the said Letters Patent should be read with these corrections therein` that the saine may conform to the record of the case in the Patent Oiiice. Signed and sealed this 9th day of March, D. 1926. "j"

M. J. Moons, Act/img Ummm'ssoner of Patents.

Certilcate of Correction.

It is hereby certified that in LettersrPntent No. 1,552,868, grunted September' 8. 1925, upon the application of Arlington Moore, of Torceste Massachusetts, for an improvement 1n Reenforcing Joints for Paper Containers, errors appeal' in the printed specification requiring correction as follows: Page 4, line 33, claim 5, before the word said insert the words inner' side of its, and line 34, strike out the word thereof "g same page, line 47, claim 6, after the compound word 11p-set insert the Words t0 form, a core, and line 48, after the Word to-gether insert the words about said core; line 49, after the word rib beginning with the comma and the article the strike out all to and including the compound .word sidewall in line 52; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 9th day of March, D. 1926.

[SEAL] M. J. MOORE,

Acting owvnw'ssioner of Patents. 

